Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method for avoiding display noise in a capacitive touch sensing device, comprising: sensing a touch input in a sensing region of an input device at a first touch sensing frequency while, simultaneously updating, at least in part, a display of the input device; analyzing incoming display data for display data noise at the first touch sensing frequency and at a second touch sensing frequency; if the display data noise at the first touch sensing frequency is higher than a threshold, adjusting touch sensing frequency to the second touch sensing frequency where the display data noise is lower than the threshold; and if the display data noise at the first touch sensing frequency is lower than the threshold, continuing sensing at the first touch sensing frequency, wherein the first touch sensing frequency and the second touch sensing frequency are parking frequencies of a display update frequency of the input device.
A capacitive touch sensing device integrates touch input detection with display updates to minimize display-induced noise. The device operates by sensing touch inputs in a sensing region at a first touch sensing frequency while simultaneously updating the display. During operation, the device analyzes incoming display data to detect noise at both the first and a second touch sensing frequency. If the noise at the first frequency exceeds a predefined threshold, the device switches to the second frequency, where noise is below the threshold. If noise remains acceptable at the first frequency, sensing continues unchanged. Both frequencies are "parking frequencies" of the display's update frequency, meaning they are harmonically related to the display's refresh rate to avoid interference. This method ensures reliable touch detection by dynamically adjusting the sensing frequency to mitigate display noise, improving accuracy in environments where display updates could otherwise corrupt touch input signals. The approach leverages frequency analysis to maintain optimal performance without requiring hardware modifications.
2. The method of claim 1 , where the incoming display data is analyzed for display data noise at the first touch sensing frequency and at the second touch sensing frequency using a Goertzel algorithm.
This invention relates to touch sensing systems that operate at multiple frequencies to reduce display noise interference. The problem addressed is the presence of display data noise that can disrupt touch sensing accuracy, particularly in systems using multiple sensing frequencies. The solution involves analyzing incoming display data to identify and mitigate noise at both the first and second touch sensing frequencies. A Goertzel algorithm is employed for this analysis, which is a computationally efficient method for detecting specific frequency components in a signal. The system first processes the display data to extract noise components at the first touch sensing frequency and then repeats the analysis for the second touch sensing frequency. By isolating these noise components, the system can adjust touch sensing operations to minimize interference, improving touch detection accuracy. The Goertzel algorithm is chosen for its ability to efficiently compute discrete Fourier transform (DFT) values at specific frequencies, making it suitable for real-time noise analysis in touch sensing applications. This approach ensures that touch sensing remains reliable even in the presence of display-induced noise, enhancing user experience in devices with integrated touch displays.
3. The method of claim 1 , where the incoming display data is analyzed for display data noise at a third touch sensing frequency, and: if the display data noise at the first touch sensing frequency and the second touch sensing frequency are each higher than the threshold, adjusting the touch sensing frequency to the third touch sensing frequency where the display data noise is lower than the threshold.
This invention relates to touch sensing systems in electronic devices, particularly addressing the problem of display data noise interfering with touch sensing accuracy. The method involves dynamically adjusting the touch sensing frequency to minimize noise from display data, which can degrade touch detection performance. The system operates by analyzing incoming display data for noise at multiple touch sensing frequencies. If the noise at a first and second touch sensing frequency exceeds a predefined threshold, the system switches to a third touch sensing frequency where the noise is below the threshold. This adaptive approach ensures reliable touch detection by avoiding frequencies where display data noise is significant. The method may also include determining the first and second touch sensing frequencies based on display data characteristics, such as display refresh rates or display data patterns, to optimize noise reduction. The system may further adjust the touch sensing frequency in response to changes in display data, ensuring continuous adaptation to varying noise conditions. This technique improves touch sensing accuracy in devices with integrated displays, such as smartphones, tablets, and touchscreen computers, by dynamically mitigating interference from display data noise.
4. The method of claim 1 , wherein analyzing incoming display data comprises analyzing display data stored in a buffer before the display data is transmitted to a display.
A system and method for analyzing display data before it is transmitted to a display. The technology addresses the need to process and evaluate visual content in real-time to improve display performance, security, or user experience. The method involves capturing display data from a buffer before it is sent to the display device. This allows for pre-processing, filtering, or modification of the data to optimize rendering, detect anomalies, or enforce security policies. The analysis may include checking for errors, detecting sensitive information, or applying visual enhancements. By examining the data in the buffer, the system can intervene before the content is displayed, ensuring compliance with policies or improving visual quality. This approach is useful in applications requiring real-time monitoring, such as cybersecurity, digital rights management, or adaptive display technologies. The method ensures that only processed and validated data reaches the display, enhancing reliability and security.
5. The method of claim 1 , further comprising: while sensing at the first touch sensing frequency, detecting external noise that is higher than the threshold at the first touch sensing frequency; and in response to detecting the external noise, adjusting the touch sensing frequency to the second touch sensing frequency where the display data noise is lower than the threshold.
A touch sensing system operates by detecting touch inputs on a display using a touch sensing frequency. The system monitors for external noise that may interfere with accurate touch detection. When the external noise exceeds a predefined threshold at the current touch sensing frequency, the system automatically adjusts the touch sensing frequency to a second frequency where the display data noise is below the threshold. This adjustment ensures reliable touch detection by minimizing interference from external noise sources. The system may also include a display driver circuit that generates display data signals and a touch sensing circuit that operates at the selected touch sensing frequency to detect touch inputs. The touch sensing circuit may use a capacitive sensing technique to detect changes in capacitance caused by touch inputs. The system dynamically adapts the touch sensing frequency to maintain accurate touch detection in the presence of varying noise conditions. This approach improves the robustness of touch sensing in environments with high levels of external interference.
6. The method of claim 1 , wherein the display data noise is generated by coupling impedance between sub-pixel routing and touch pixel routing.
A method for generating display data noise in a touch-sensitive display system addresses the challenge of accurately detecting touch inputs while minimizing interference from display signals. The system includes a display panel with sub-pixels and touch pixels, each having dedicated routing pathways. The method involves introducing noise into the display data by exploiting the inherent coupling impedance between the sub-pixel routing and the touch pixel routing. This coupling impedance creates parasitic effects that generate noise in the touch sensing signals, which can be used to improve touch detection accuracy or to mask display-related interference. The noise generation is passive, relying on the physical layout and electrical properties of the routing rather than active signal injection. This approach helps distinguish touch inputs from display artifacts, enhancing the reliability of touch sensing in integrated display and touch systems. The method is particularly useful in high-resolution displays where display signals can overwhelm touch sensing circuits, ensuring robust touch performance without additional hardware components.
7. An input device for capacitive touch sensing, comprising: a capacitive touch sensor configured to: sense a touch input in a sensing region at a first touch sensing frequency, while, the input device simultaneously updates, at least in part, a display; and a processing system configured to: analyze incoming display data for display data noise at the first touch sensing frequency and at a second touch sensing frequency; if the display data noise at the first touch sensing frequency is higher than a threshold, adjust touch sensing frequency to the second touch sensing frequency where the display data noise is lower than the threshold; and if the display data noise at the first touch sensing frequency is lower than the threshold, continue sensing at the first touch sensing frequency, wherein the first touch sensing frequency and the second touch sensing frequency are parking frequencies of a display update frequency of the input device.
This invention relates to capacitive touch sensing technology, specifically addressing interference issues between touch sensing and display updates in electronic devices. The problem arises when display updates generate noise at the same frequency as the touch sensor's operating frequency, leading to inaccurate touch detection. The solution involves an input device with a capacitive touch sensor and a processing system. The touch sensor operates at a first touch sensing frequency while the display is updated simultaneously. The processing system analyzes incoming display data to detect noise at both the first and a second touch sensing frequency. If the noise at the first frequency exceeds a predefined threshold, the system switches to the second frequency where noise is lower. If noise remains acceptable, the system continues using the first frequency. Both frequencies are "parking frequencies" of the display's update frequency, meaning they are harmonics or sub-harmonics of the display's refresh rate. This adaptive frequency switching ensures reliable touch sensing by minimizing display-induced interference. The system dynamically adjusts to maintain accuracy without requiring manual calibration or hardware changes.
8. The input device of claim 7 , where the processing system is further configured to analyze incoming display data for display data noise at the first touch sensing frequency and at the second touch sensing frequency using a Goertzel algorithm.
The invention relates to an input device with enhanced touch sensing capabilities, particularly addressing the challenge of accurately detecting touch inputs while minimizing interference from display noise. The device includes a touch sensor configured to operate at a first touch sensing frequency and a second touch sensing frequency, where the second frequency is a harmonic of the first. A processing system is integrated to analyze incoming display data for noise at both frequencies using a Goertzel algorithm, a computational technique optimized for detecting specific frequency components in a signal. This analysis helps distinguish between actual touch inputs and noise generated by the display, improving touch detection accuracy. The processing system may also adjust the touch sensing frequencies based on the detected noise, ensuring robust performance even in environments with varying interference levels. The device is designed to operate in systems where display noise could otherwise degrade touch sensitivity, such as in high-resolution or high-refresh-rate displays. By leveraging the Goertzel algorithm, the system efficiently filters out noise without requiring extensive computational resources, making it suitable for real-time applications. The overall solution enhances touch input reliability in modern electronic devices.
9. The input device of claim 7 , where the processing system is further configured to: analyze incoming display data for display data noise at a third touch sensing frequency; and if the display data noise at the first touch sensing frequency and the second touch sensing frequency are each higher than the threshold, adjust the touch sensing frequency to the third touch sensing frequency where the display data noise is lower than the threshold.
This invention relates to input devices, specifically touch-sensitive displays, and addresses the problem of display data noise interfering with touch sensing accuracy. The device includes a display panel with a plurality of touch sensing electrodes and a processing system. The processing system is configured to detect touch inputs by driving the electrodes at a first touch sensing frequency and analyzing resulting touch sensing signals. If display data noise at this frequency exceeds a predefined threshold, the system switches to a second touch sensing frequency and repeats the analysis. If noise at both frequencies remains above the threshold, the system further analyzes display data noise at a third touch sensing frequency. If noise at the third frequency is below the threshold, the system adjusts the touch sensing frequency to this third frequency to minimize interference and improve touch detection accuracy. The invention ensures reliable touch input detection by dynamically selecting an optimal sensing frequency based on real-time noise analysis, enhancing performance in environments with varying noise conditions.
10. The input device of claim 7 , further comprising a driver module that updates a display with incoming display data while the capacitive touch sensor simultaneously senses touch inputs.
The invention relates to an input device with integrated capacitive touch sensing and display updating capabilities. The device addresses the challenge of maintaining responsive touch input detection while dynamically updating a display, which is critical for applications requiring real-time interaction, such as touchscreens in smartphones, tablets, or interactive displays. The input device includes a capacitive touch sensor that continuously monitors for touch inputs, such as finger or stylus interactions, without interrupting the display's refresh cycle. A driver module is integrated to manage the display updates, ensuring that incoming display data is rendered on the screen while the touch sensor remains active. This simultaneous operation prevents delays or lag in touch response, enhancing user experience by maintaining synchronization between visual feedback and touch input detection. The device may also include a touch controller that processes raw touch data from the sensor and converts it into usable input signals for the system. The driver module coordinates with the touch controller to prioritize touch sensing during display updates, minimizing interference and ensuring accurate touch detection. This design is particularly useful in high-performance touch interfaces where both display responsiveness and touch sensitivity are critical.
11. The input device of claim 7 , wherein the processing system is further configured to analyze incoming display data stored in a buffer before the display data is transmitted to a display.
The invention relates to an input device with enhanced processing capabilities for analyzing display data before it is sent to a display. The device includes a processing system that examines incoming display data stored in a buffer, allowing for real-time adjustments or optimizations before the data is rendered on a display. This preprocessing step can improve display performance, reduce latency, or enable additional features such as dynamic resolution scaling, frame rate adjustments, or content-based optimizations. The processing system may also interact with other components of the input device, such as sensors or user interface elements, to further refine the display output based on contextual or environmental factors. By analyzing the display data before transmission, the device ensures smoother visual output and better synchronization with user inputs, enhancing overall user experience. The invention is particularly useful in applications requiring high-performance displays, such as gaming, virtual reality, or high-frequency trading systems, where real-time data processing and low-latency display updates are critical.
12. The input device of claim 7 , wherein the processing system is further configured to: while sensing at the first touch sensing frequency, detect external noise that is higher than the threshold at the first touch sensing frequency; and in response to detecting the external noise, adjust the touch sensing frequency to the second touch sensing frequency where the display data noise is lower than the threshold.
A touch-sensitive input device includes a display panel with integrated touch sensors and a processing system that dynamically adjusts the touch sensing frequency to mitigate noise interference. The device operates by sensing touch inputs at a first frequency, monitoring for external noise that exceeds a predefined threshold, and automatically switching to a second frequency if noise is detected. The second frequency is selected to reduce display data noise below the threshold, ensuring reliable touch detection. The processing system may also adjust the touch sensing frequency based on display content, such as video or static images, to further optimize performance. The device may include a touch sensor array with multiple sensing electrodes and a display driver configured to drive the display panel while minimizing interference with touch sensing. The system dynamically balances touch sensitivity and noise reduction to maintain accurate input detection under varying environmental and operational conditions. This approach improves touchscreen reliability in noisy environments by adaptively avoiding frequencies where external or display-induced noise could degrade performance.
13. The input device of claim 7 , wherein display data noise is generated by coupling impedance between sub-pixel routing and touch pixel routing.
The invention relates to input devices, particularly those integrating touch sensing and display functionalities, addressing the challenge of interference between display and touch sensing circuits. The device includes a display panel with sub-pixels and touch sensing pixels, where each sub-pixel is connected to a sub-pixel routing line and each touch pixel is connected to a touch pixel routing line. The invention specifically addresses display data noise generated by capacitive coupling between these routing lines, which can degrade touch sensing accuracy. To mitigate this, the device incorporates impedance elements between the sub-pixel routing and touch pixel routing lines. These impedance elements reduce unwanted coupling, minimizing noise and improving touch sensing performance. The impedance elements may include resistors, capacitors, or other passive components strategically placed to disrupt parasitic coupling paths. The solution ensures reliable touch detection even in high-resolution displays where routing lines are densely packed, enhancing overall device functionality. The invention is applicable to touchscreen displays in smartphones, tablets, and other electronic devices where display and touch sensing circuits coexist.
14. A processing system for avoiding display noise in a capacitive touch sensing device, the processing system comprising: a receiver module configured to: sense a touch input in a sensing region at a first touch sensing frequency while, simultaneously updating, at least in part, a display of the input device; and processing circuitry configured to: analyze incoming display data for display data noise at the first touch sensing frequency and at a second touch sensing frequency; if the display data noise at the first touch sensing frequency is higher than a threshold, adjust touch sensing frequency to the second touch sensing frequency where the display data noise is lower than the threshold; and if the display data noise at the first touch sensing frequency is lower than the threshold, continue sensing at the first touch sensing frequency, wherein the first touch sensing frequency and the second touch sensing frequency are parking frequencies of a display update frequency of the input device.
Capacitive touch sensing devices often experience display noise interference, which can degrade touch input accuracy. This invention addresses the problem by dynamically adjusting the touch sensing frequency to minimize noise from display updates. The system includes a receiver module that simultaneously senses touch inputs and updates the display. Processing circuitry analyzes incoming display data for noise at both a primary (first) and secondary (second) touch sensing frequencies. If noise at the primary frequency exceeds a predefined threshold, the system switches to the secondary frequency where noise is lower. If noise remains acceptable, the primary frequency is retained. Both frequencies are "parking frequencies" synchronized with the display's update frequency, ensuring compatibility with display operations. This adaptive approach maintains touch sensitivity while reducing interference, improving overall performance in touch-sensitive displays. The system dynamically responds to noise conditions without requiring manual adjustments, enhancing reliability in environments with varying display noise levels.
15. The processing system of claim 14 , where the processing circuitry is further configured to analyze incoming display data for display data noise at the first touch sensing frequency and at the second touch sensing frequency using a Goertzel algorithm.
A processing system for touch-sensitive displays analyzes display data to reduce noise interference during touch sensing. The system operates at two distinct touch sensing frequencies to detect touch inputs while minimizing interference from display signals. The processing circuitry is configured to analyze incoming display data for noise at both touch sensing frequencies using a Goertzel algorithm, which efficiently identifies specific frequency components in a signal. This allows the system to distinguish between touch-related signals and display-induced noise, improving touch accuracy. The processing circuitry may also adjust display data timing to avoid interference with touch sensing operations, ensuring reliable touch detection even when the display is actively updating. By combining frequency analysis with timing adjustments, the system enhances touch performance in displays where display signals could otherwise corrupt touch sensing. The Goertzel algorithm provides a computationally efficient way to detect noise at the relevant frequencies, making the solution practical for real-time applications. This approach is particularly useful in high-resolution or high-refresh-rate displays where display noise can significantly impact touch sensitivity.
16. The processing system of claim 14 , where the processing circuitry is further configured to: analyze incoming display data for display data noise at a third touch sensing frequency; and if the display data noise at the first touch sensing frequency and the second touch sensing frequency are each higher than the threshold, adjust the touch sensing frequency to the third touch sensing frequency where the display data noise is lower than the threshold.
A processing system for touch-sensitive displays reduces interference from display data noise during touch sensing. The system operates by detecting and mitigating noise that can disrupt touch signal accuracy. The processing circuitry analyzes incoming display data to identify noise at multiple touch sensing frequencies. If noise levels at a first and second touch sensing frequency exceed a predefined threshold, the system switches to a third touch sensing frequency where the noise is below the threshold. This dynamic adjustment ensures reliable touch detection by avoiding frequencies with excessive display-induced interference. The system may also include a touch controller that generates touch sensing signals and a display driver that outputs display data, both synchronized to minimize noise impact. The processing circuitry further filters the touch sensing signals to remove residual noise, enhancing signal clarity. This approach improves touchscreen performance in environments where display noise could otherwise degrade touch responsiveness.
17. The processing system of claim 14 , further comprising a driver module that updates a display with incoming display data while the receiver module simultaneously senses touch inputs.
A processing system for electronic devices integrates a driver module and a receiver module to enable simultaneous display updates and touch input sensing. The system operates in devices requiring real-time interaction, such as smartphones or tablets, where delays between touch detection and display response degrade user experience. The driver module continuously refreshes the display with incoming data, ensuring smooth visual output. Concurrently, the receiver module detects touch inputs without interrupting the display updates, allowing seamless interaction. This dual-function operation eliminates the need for time-division multiplexing, where touch sensing and display driving alternate, reducing latency and improving responsiveness. The system may include additional components like a touch controller to process raw touch signals or a synchronization mechanism to align display updates with touch sampling. By enabling parallel processing of display and touch functions, the system enhances performance in touch-sensitive devices, particularly in applications demanding high refresh rates and low-latency touch response.
18. The processing system of claim 14 , wherein the processing circuitry is further configured to analyze incoming display data stored in a buffer before the display data is transmitted to a display.
A processing system for optimizing display data transmission includes circuitry configured to analyze incoming display data stored in a buffer before the data is sent to a display. The system monitors the buffer to detect changes in the display data, such as pixel updates or frame modifications, to determine whether the data requires further processing or can be transmitted directly. The analysis may involve comparing the incoming data with previously processed data to identify redundant or unchanged portions, reducing unnecessary processing steps. The system may also prioritize data based on its relevance to the display output, ensuring that critical updates are processed first while less important data is handled efficiently. This approach minimizes processing overhead and improves display performance by avoiding redundant operations on unchanged data. The system may integrate with a display controller or graphics processing unit (GPU) to streamline data flow and enhance overall system efficiency. The analysis step ensures that only necessary data modifications are applied, reducing power consumption and latency in display rendering. The system is particularly useful in applications requiring real-time display updates, such as gaming, video streaming, or high-resolution display systems.
19. The processing system of claim 14 , wherein the processing circuitry is further configured to: while sensing at the first touch sensing frequency, detect external noise at the first touch sensing frequency; and in response to detecting the external noise, adjust the touch sensing frequency to the second touch sensing frequency where the display data noise is lower than the threshold.
A processing system for touch-sensitive displays addresses the challenge of maintaining accurate touch sensing in the presence of external noise and display-generated interference. The system includes processing circuitry that operates at a first touch sensing frequency to detect touch inputs on a display. The circuitry is configured to monitor for external noise at this frequency. When such noise is detected, the system dynamically adjusts the touch sensing frequency to a second frequency where display data noise is below a predefined threshold, ensuring reliable touch detection. The display data noise is generated by the display's operation, and the threshold defines an acceptable noise level for accurate touch sensing. This adaptive frequency adjustment mitigates interference from both external sources and internal display noise, improving touch sensitivity and accuracy. The system may also include additional components such as a touch sensor array and a display driver, which work together to enable the frequency adjustment process. By dynamically selecting the optimal sensing frequency, the system enhances touch performance in noisy environments.
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April 21, 2020
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